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D300s vs D300 auto-ISO flash issue

PIKBill

Miami, US
12 posts

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PIKBill Gold Member Nikonian since 12th Oct 2012
Sun 18-Nov-12 09:24 PM

Hi All,

This is my first post and I am glad to be a part of the
community. I have learned a lot  here already.

I have owned a D300 for the past 3 years and have love it.
Recently I purchased a D700 and decided I like the controls
(multiselector and menus) much better so yesterday I purchased
a used D300s locally to replace my D300 for the improved (in
my opinion) usage features. The camera has about 56k clicks
and has been very well maintained by the previous owner.

The issue (I think) I am having with the D300s is when using
auto-ISO in P mode. it is different than how my D300 and D700
work but  I do not know if it is a problem or a setting. my
test conditions are a dimly lit room and using the same 35mm
AF-S 1:1.8G on them both. auto-ISO settings are a min of 200,
max of 1600 and a 1/60th speed in P mode. I am using matrix
metering and iTTL. I have spent considerable time to go
through the menu’s on my D300 and the D300s to make sure
they are exact as far as i can tell.

When not using a flash, the D300s automatically uses the
largest aperture (1.8) and will boost ISO in darker conditions
as I would expect. but when I use the built-in flash, the
camera then drops the aperture to 5.6 but also raises the ISO
to 800 or 1600, even higher than non-flash mode usually. I
also get the same hi ISO’s using either the built-in or
either of my SB-600 or SB-800.

on my D300 with the same settings, lens and lighting
conditions, when I use a flash, my D300 drops to the minimum
ISO of 200 and the images are noticeably cleaner compared to
the D300s due to the lower ISO used.

What I would like to know is if I may have a problem with the
D300s or if I have something set incorrectly? is this just a
known difference between the D300 and D300s? on the D300s, the
pop-up flash has a yellow-tint on the glass but I do not think
it matters since I still see the hi-ISO’s with the external
flashes.

Any ideas are greatly appreciated and let me know if I need to
provide more info.

Thank you,

Bill

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